can someone help me understand these two problems? (b) Rank in order of increasing number of…

can someone help me understand these two problems?

(b) Rank in order of increasing number of unique monobrominated products resulting from radical halogenation with N-bromosuccinimide (NBS) and UV light (1 fewest, 4most). (c) Rank in order of increasing pKa for the indicated H (1 = lowest pKa, 4-highest pKa). 2 ㄐ